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1 <br /> (KL E/NFEL OER <br /> Bright People.R,ghr Solut—s <br /> 2 FIELD INVESTIGATION AND LABORATORY TESTING <br /> 2.1 FIELD INVESTIGATION <br /> On August 12, 2019, percolation test holes PT-1 and PT-2 were drilled within the proposed leach <br /> field area to depths of about 3 and 5 feet below site grade. The approximate percolation test hole <br /> locations are presented on Figure 2. Following drilling, the sides of the test holes were scored, <br /> and significant loose material was removed from the bottom of the holes. The percolation test <br /> holes were then prepared by first placing about 2 inches of fine gravel at the bottom of the holes <br /> and installing a 4-inch diameter, perforated PVC pipe. Before 8:00 AM on August 12, 2019, about <br /> 6 inches of water was placed in the holes for pre-soaking. On August 13, 2019, the percolation <br /> tests were started at about 9:00 AM in accordance with SJCEHD accepted guidelines, using clear <br /> potable water. The holes did not exhibit sloughing or caving and were empty of water prior to <br /> testing. From a fixed reference point (a marked location on the side of PVC pipe), the drop in <br /> water level was measured in approximate 30-minute intervals for 4 hours (SJCEHD Procedure <br /> #2), refilling as necessary to maintain the prescribed amount of water over the gravel. Under the <br /> observation of a representative from the SJCEHD, the last 30-minute readings of the tests were <br /> observed and the percolation rates, in minutes per inch, were calculated. Copies of our field <br /> percolation test results are attached on Figure 6. <br /> The percolation test holes were located in the field by visual sighting and/or pacing from existing <br /> site features; therefore, the locations shown on Figure 2 should be considered approximate. <br /> 2.2 LABORATORY TESTING <br /> Laboratory tests on water samples recovered from the on-site well nearest the proposed septic <br /> system were performed by Fruit Growers Laboratory (FGL). The following laboratory tests were <br /> assigned. <br /> • Nitrate (N) <br /> The water sample obtained from the well was delivered to a laboratory on ice the same day using <br /> chain-of-custody procedures. Laboratory test results are presented in Appendix B. <br /> 20200144.002A/ST019R101556 Page 3 of 14 September 24, 2019 <br /> C 2019 Kleinfelder www.kleinfelder.com <br />